Air pump



FIG. 1 is a perspective view of an air pump;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1-7 represent portions of the air pump that form no part of the claimed design. 

CLAIM We claim the ornamental design for an air pump, as shown and described. 